Heat Advisory — Greene, IL, Macoupin, IL, Montgomery, IL, Fayette, IL, Calhoun, IL, Jersey, IL, Boone, MO, Callaway, MO, Montgomery, MO, Lincoln, MO 8:00 PM

Montgomery County, Illinois, United States

Last updated: 7:39 AM CDT  ·  Refresh
23°C
Feels like 25°
Partly Cloudy
▲ 32°  /  ▼ 22°
Wind
6 mph ENE
Humidity
93%
Dew Point
22°
Pressure
29.48 inHg
Visibility
9 mi
UV Index
2.5
Cloud Cover
41%
Sunrise
6:42 AM
Sunset
7:01 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Montgomery County is currently partly cloudy at 23°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2048 J/kg) — isolated convective development possible. Sunrise: 6:42AM · Sunset: 7:01PM.

Alerts

Heat Advisory
Greene, IL, Macoupin, IL, Montgomery, IL, Fayette, IL, Calhoun, IL, Jersey, IL, Boone, MO, Callaway, MO, Montgomery, MO, Lincoln, MO
Expires 8:00 PM
46 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
23°
12%
8 AM
23°
29%
9 AM
24°
34%
10 AM
27°
44%
11 AM
28°
37%
12 PM
30°
32%
1 PM
32°
31%
2 PM
32°
33%
3 PM
32°
33%
4 PM
31°
41%
5 PM
32°
41%
6 PM
31°
42%
7 PM
29°
44%
8 PM
28°
45%
9 PM
25°
41%
10 PM
24°
34%
11 PM
24°
35%
12 AM
23°
27%
1 AM
23°
22%
2 AM
23°
22%
3 AM
23°
22%
4 AM
23°
22%
5 AM
22°
23%
6 AM
22°
20%
7-Day Forecast
Today
32° 22°
Mostly Clear with a 44% chance of rain.
Sat
36° 22°
Partly Cloudy with a 22% chance of rain.
Sun
34° 19°
Mostly Cloudy with a 58% chance of rain.
Mon
26° 16°
Partly Cloudy with a 73% chance of rain.
Tue
22° 13°
Overcast with a 41% chance of rain.
Wed
25° 13°
Mostly Cloudy.
Thu
24° 12°
Overcast.
TimeTempConditionsPrecipWindHumidity
Now 23° Partly Cloudy 12% 6 mph ENE 93%
8 AM 23° Partly Cloudy 29% 7 mph ENE 87%
9 AM 24° Partly Cloudy 34% 6 mph E 81%
10 AM 27° Mostly Clear 44% 5 mph E 74%
11 AM 28° Clear 37% 4 mph E 68%
12 PM 30° Clear 32% 4 mph E 61%
1 PM 32° Clear 31% 4 mph ESE 60%
2 PM 32° Mostly Clear 33% 5 mph SE 62%
3 PM 32° Partly Cloudy 33% 6 mph SSW 64%
4 PM 31° Partly Cloudy 41% 6 mph WNW 66%
5 PM 32° Mostly Clear 41% 8 mph N 69%
6 PM 31° Mostly Clear 42% 10 mph N 73%
7 PM 29° Drizzle 44% 9 mph NNE 77%
8 PM 28° Drizzle 45% 6 mph ENE 80%
9 PM 25° Drizzle 41% 7 mph SE 83%
10 PM 24° Partly Cloudy 34% 8 mph ESE 88%
11 PM 24° Partly Cloudy 35% 8 mph ESE 90%
12 AM 23° Partly Cloudy 27% 8 mph SE 91%
1 AM 23° Partly Cloudy 22% 7 mph SE 92%
2 AM 23° Partly Cloudy 22% 7 mph SE 93%
3 AM 23° Partly Cloudy 22% 7 mph SE 94%
4 AM 23° Partly Cloudy 22% 7 mph SSE 94%
5 AM 22° Partly Cloudy 23% 7 mph SSE 94%
6 AM 22° Haze 20% 7 mph SSE 93%
15-Day Forecast
Today
9/18
Mostly Clear
44%
22°
32°
Sat
9/19
Partly Cloudy
22%
22°
36°
Sun
9/20
Mostly Cloudy
58%
19°
34°
Mon
9/21
Partly Cloudy
73%
16°
26°
Tue
9/22
Overcast
41%
13°
22°
Wed
9/23
Mostly Cloudy
5%
13°
25°
Thu
9/24
Overcast
10%
12°
24°
Fri
9/25
Overcast
27%
13°
24°
Sat
9/26
Mostly Cloudy
21%
13°
25°
Sun
9/27
Clear
34%
13°
25°
Mon
9/28
Drizzle
60%
14°
28°
Tue
9/29
Clear
60%
15°
29°
Wed
9/30
Drizzle
60%
15°
29°
Thu
10/1
Drizzle
60%
15°
29°
Fri
10/2
Drizzle
60%
13°
27°
46
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
41 AQI 7.3 µg/m³
O3
Ground-level ozone
Dominant
46 AQI 50 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Sat 46 Good 46 41
Sun 47 Good 47 46
Mon 44 Good 44 39
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Fri Sep 18, 11:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE400 J/kg
MLCAPE606 J/kg
MUCAPE1259 J/kg
SBCIN-317 J/kg
MLCIN-231 J/kg
Lifted Index-2.0
Kinematics
0–6 km Shear18 kt
0–1 km Shear17 kt
Eff. Shear5 kt
0–1 km SRH62
0–3 km SRH47
Eff. SRH7
Storm Motion329° @ 19 kt
0–1 km EHI0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index42.5
Thermo & Levels
PWAT1.86 in
0–3 km LR4.7 °C/km
700–500 LR5.6 °C/km
Total Totals50.5
LCL984 hPa
LFC724 hPa
EL253 hPa
Freezing Lvl14,787 ft